US PATENT SUBCLASS 552 / 545
.~.~.~.~ Processes of isolating, purifying or recovering from animal, vegetable or fungal sources (e.g., wool fat or grease, lanolin, fish oils, animal tissue, soybean oil, tall oil or pitch, wood products, sugar cane, soap stocks, yeast, molds, etc.)

Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
540  DF  .~.~ Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of six or more uninterrupted carbons (e.g., sterols, etc.) {4}
544  DF  .~.~.~ Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., cholesterols, cholestanols, stigmasterols, etc.) {3}
545.~.~.~.~ Processes of isolating, purifying or recovering from animal, vegetable or fungal sources (e.g., wool fat or grease, lanolin, fish oils, animal tissue, soybean oil, tall oil or pitch, wood products, sugar cane, soap stocks, yeast, molds, etc.)

DEFINITION

Classification: 552/545

(under subclass 544) Processes which include isolating, purifying or recovering the cyclopentanohydrophenanthrene containing compound from animal, vegetable or fungal sources.